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| SMDA05 THRU SMDA24 Unidirectional TVS Array for Protection of Four Lines PROTECTION PRODUCTS Description The SMDAxx series of TVS arrays are designed to provide undirectional protection for sensitive electronics from damage or latch-up due to ESD, lightning and other voltage-induced transient events. Each device will protect four data or I/O lines. They are available with operating voltages of 5V, 12V, 15V and 24V. TVS diodes are solid-state devices designed specifically for transient suppression. They offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage and no device degradation. The low profile SO-8 package allows the user to protect up to four independent lines with one package. The SMDAxx series is suitable protection for sensitive semiconductors components such as microprocessors, ASICs, transceivers, transducers, and CMOS memory. The SMDAxx series devices may be used to meet the ESD immunity requirements of IEC 61000-4-2, level 4 for air and contact discharge. Features u Transient protection for data lines to IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 12A (8/20s) Undirectional protection Small SO-8 package Protects four I/O lines Working voltages: 5V, 12V, 15V and 24V Low leakage current Low operating and clamping voltages Solid-state silicon avalanche technology u u u u u u u u u u u u u u u u u u Mechanical Characteristics JEDEC SO-8 package Molding compound flammability rating: UL 94V-0 Marking : Part number, date code, logo Packaging : Tube or Tape and Reel per EIA 481 Applications RS-232 data lines Microprocessor based equipment Notebooks, Desktops, & Servers Instrumentation LAN/WAN equipment Peripherals Serial and Parallel Ports Schematic & PIN Configuration 1 8 2 7 3 6 4 5 SO-8 (Top View) Revision 9/2000 1 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Absolute Maximum Rating R ating Peak Pulse Pow er (tp = 8/20 s) ESD Voltage (HBM p er (IEC 61000-4-2) Lead Sold ering Temp erature Op erating Temp erature Storage Temp erature TL TJ TSTG Symbo l Pp k Value 300 >25 260 (10 sec.) -55 to +125 -55 to +150 Units Watts kV C C C Electrical Characteristics SMDA05 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Maximum Peak Pulse Current Junction Cap acitance Symbo l VRWM V BR IR VC VC I PP Cj It = 1mA V RWM = 5V, T=25C IPP = 1A , tp = 8/20 s IPP = 5A , tp = 8/20 s tp = 8/20 s V R = 0V, f = 1MHz 6 20 9.8 11 17 400 Co nd itio ns Minimum Typ ical Maximum 5 Units V V A V V A pF SMDA12 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Maximum Peak Pulse Current Junction Cap acitance Symbo l VRWM V BR IR VC VC I PP Cj It = 1mA V RWM = 12V, T=25C IPP = 1A , tp = 8/20 s IPP = 5A , tp = 8/20 s tp = 8/20 s V R = 0V, f = 1MHz 13.3 1 19 24 12 150 Co nd itio ns Minimum Typ ical Maximum 12 Units V V A V V A pF a 2000 Semtech Corp. 2 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Electrical Characteristics (Continued) SMDA15 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Maximum Peak Pulse Current Junction Cap acitance Symbo l VRWM V BR IR VC VC I PP Cj It = 1mA V RWM = 15V, T=25C IPP = 1A , tp = 8/20 s IPP = 5A , tp = 8/20 s tp = 8/20 s V R = 0V, f = 1MHz 16.7 1 24 30 10 100 Co nd itio ns Minimum Typ ical Maximum 15 Units V V A V V A pF SMDA24 Par ame te r Reverse Stand -Off Voltage Reverse Breakd ow n Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Maximum Peak Pulse Current Junction Cap acitance Symbo l VRWM V BR IR VC VC I PP Cj It = 1mA V RWM = 24V, T=25C IPP = 1A , tp = 8/20 s IPP = 5A , tp = 8/20 s tp = 8/20 s V R = 0V, f = 1MHz 26.7 1 43 55 5 60 Co nd itio ns Minimum Typ ical Maximum 24 Units V V A V V A pF a 2000 Semtech Corp. 3 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time 10 110 100 Peak Pulse Power - P PP (kW) 90 % of Rated Power or IPP 80 70 60 50 40 30 20 10 0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000 0 0 25 50 75 100 125 150 Ambient Temperature - TA (oC) 1 Power Derating Curve 0.1 Pulse Waveform 110 100 90 80 Percent of IPP 70 60 50 40 30 20 10 0 0 5 10 15 Time (s) 20 25 30 td = IPP/2 e -t Waveform Parameters: tr = 8s td = 20s ESD Pulse Waveform (IEC 61000-4-2) Level IEC 61000-4-2 Discharge Parameters First Peak Current (A) 1 2 3 4 7.5 15 22.5 30 Peak Current at 30 ns (A) 4 8 12 16 Peak Current at 60 ns (A) 8 4 6 8 Test Test Voltage Voltage (Contact ( A ir Disch arge) Disch arge) (kV ) (kV ) 2 4 6 8 2 4 8 15 a 2000 Semtech Corp. 4 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Applications Information Device Connection for Protection of Four Data Lines The SMDAxx series devices are designed to protect up to four data lines. The devices are connected as follows: l Circuit Diagram The SMDAxx are unidirectional devices and are designed for use on lines where the normal operating voltage is above ground. Pins 1, 2, 3, and 4 are connected to the protected lines. Pins 5, 6, 7, and 8 are connected to ground. The ground connections should be made directly to the ground plane for best results. The path length is kept as short as possible to reduce the effects of parasitic inductance in the board traces. 1 8 2 7 3 6 4 5 Circuit Board Layout Recommendations for Suppression of ESD. Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are recommended: l l l l l l I/O Line Protection Place the TVS near the input terminals or connectors to restrict transient coupling. Minimize the path length between the TVS and the protected line. Minimize all conductive loops including power and ground loops. The ESD transient return path to ground should be kept as short as possible. Never run critical signals near board edges. Use ground planes whenever possible. Typical Connection To Protected Device 1 8 2 7 Ground 3 6 4 5 From Connector a 2000 Semtech Corp. 5 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Outline Drawing - SO-8 Land Pattern - SO-8 a 2000 Semtech Corp. 6 www.semtech.com SMDA05 THRU SMDA24 PROTECTION PRODUCTS Ordering Information Par t Numbe r SMDA 05.TB SMDA 12.TB SMDA 15.TB SMDA 24.TB Wo r king Vo ltage 5V 12V 15V 24V Qty p e r Reel 500 500 500 500 R e e l Size 7 Inch 7 Inch 7 Inch 7 Inch Note: (1) No suffix indicates tube pack. (2) Consult factory for availability of 13 Inch reels. Contact Information Semtech Corporation Protection Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804 a 2000 Semtech Corp. 7 www.semtech.com |
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